Not Equal: Everything in this space must be different. The answer is 6-1, placed vertically; 6-3, placed horizontally; 5-0, placed horizontally; 1-4, placed vertically; 2-4, placed horizontally.
This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.，更多细节参见91视频
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Pakistan now in 'open war' with Afghanistan, defence minister says, after countries trade attacks。关于这个话题，Line官方版本下载提供了深入分析
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